kodev(feat): add cov command

kodev

@@ -320,6 +320,63 @@ OPTIONS:
     popd
 }
 
+function kodev-cov {
+    COV_HELP_MSG="
+usage: cov <OPTIONS>
+
+OPTIONS:
+
+    --show-previous     show coverage stats from previous run
+    --full              show full coverage report (down to each line)
+    "
+    show_full=0
+    show_previous=0
+    while [[ $1 == '-'* ]]; do
+        PARAM=$(echo "$1" | awk -F= '{print $1}')
+        VALUE=$(echo "$1" | awk -F= '{print $2}')
+        case $PARAM in
+            --full)
+                show_full=1 ;;
+            --show-previous)
+                show_previous=1 ;;
+            -h | --help)
+                echo "${COV_HELP_MSG}"; exit 0 ;;
+            *)
+                echo "ERROR: unknown option \"$PARAM\""
+                echo "${COV_HELP_MSG}"; exit 1 ;;
+        esac
+        shift
+    done
+
+    check_submodules && make
+    setup_env
+    make "${EMU_DIR}/.busted"
+    pushd "${EMU_DIR}"
+        target=front
+        test_path="./spec/${target}/unit"
+        if [ ${show_previous} -eq 0 ]; then
+            echo "Running tests in" ${test_path}
+            busted --lua="./luajit" \
+                --sort-files \
+                --no-auto-insulate \
+                --lazy \
+                -o "./spec/${target}/unit/verbose_print" \
+                --coverage \
+                --exclude-tags=nocov "${test_path}" || {
+                    echo "Failed to run tests!" && exit 1;
+                }
+        fi
+        if [ ${show_full} -eq 1 ]; then
+            cat luacov.report.out
+        else
+            tail -n \
+                +$(($(grep -nm1 -e '^Summary$' luacov.report.out|cut -d: -f1)-1)) \
+                luacov.report.out
+        fi
+    popd
+}
+
+
 function kodev-log {
     LOG_HELP_MSG="
 usage: log <TARGET>
@@ -380,6 +437,8 @@ case $1 in
         shift 1; kodev-run "$@" ;;
     test)
         shift 1; kodev-test "$@" ;;
+    cov)
+        shift 1; kodev-cov "$@" ;;
     prompt)
         kodev-build
         pushd "${EMU_DIR}"